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Segment Information - Schedule of Total Revenues, Operating Profit and Total Asset for Reporting Segment (Parenthetical) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jul. 01, 2016 | Jun. 30, 2017 | Jul. 01, 2016
Segment Reporting Information [Line Items] |  |  |  |
Restructuring and other charges | $ 10,700 | $ 32,920 | $ 115,899 | $ 136,671
Buildings & Infrastructure |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring and other charges | $ 1,246 |  | $ 23,844 |

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- Definition Restructuring and other charges. + References No definition available. + Details
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Namespace Prefix: | jec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=jec_BuildingsAndInfrastructureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |